After a few years of leading the world and receiving free rent, some ex-presidents and prime ministers go on to other, more lucrative careers. Harry Truman only had his $112 a month army pension when he left office, so he rolled up his sleeves and went to work writing his memoirs. He was still in such poor financial straits that he became the first recipient of a presidential pension. Other world leaders did much better. mental_floss takes a look at what some of them do for money now that they are out of office. Link